Rihanna Collaborates With Chris Brown... TWICE

On 'Birthday Cake' and 'Turn Up The Music' remixes...

Rumours that Chris Brown is the mystery collaborator on Rihanna's 'Birthday Cake' were confirmed overnight, as the Bajan superstar unveiled the full-length cut of the track.

A shorter version had appeared on her latest album, Talk That Talk.

Brown's verse lyrics include: "Girl, I wanna **** you right now / Been a long time, I'm missing your body". Aww, what a gent.

Listen to 'Birthday Cake (Remix)' below:

What's more, Rihanna has returnedthe favour by appearing on Brown's new single 'Turn Up The Music'. She wrote on Twitter: "It's a download OVERLOAD!!! Working on more links for u guys, so err body could have some #CAKE (sic)"